#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Copyright (C) 2018 Andy Stewart
#
# Author:     Andy Stewart <lazycat.manatee@gmail.com>
# Maintainer: Andy Stewart <lazycat.manatee@gmail.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from PyQt5.QtCore import QUrl
from PyQt5.QtGui import QColor
from core.browser_buffer import BrowserBuffer
from core.utils import PostGui
import os
import socket
import subprocess
import threading

class AppBuffer(BrowserBuffer):
    def __init__(self, buffer_id, url, arguments):
        BrowserBuffer.__init__(self, buffer_id, url, arguments, False, QColor(255, 255, 255, 255))

        # Get free port to render markdown.
        self.port = self.get_free_port()
        self.url = url

        # Start markdown render process.
        if arguments == "":
            subprocess.Popen("grip {0} {1}".format(url, self.port), shell=True)
        else:
            subprocess.Popen("grip --pass {0} {1} {2}".format(arguments, url, self.port), shell=True)

        # Add timer make load markdown preview link after grip process start finish.
        timer = threading.Timer(2, self.load_markdown_server)
        timer.start()

    def get_free_port(self):
        """
        Determines a free port using sockets.
        """
        free_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        free_socket.bind(('0.0.0.0', 0))
        free_socket.listen(5)
        port = free_socket.getsockname()[1]
        free_socket.close()

        return port

    @PostGui()
    def load_markdown_server(self):
        self.buffer_widget.setUrl(QUrl("http://localhost:{0}".format(self.port)))

        paths = os.path.split(self.url)
        if len(paths) > 0:
            self.change_title(paths[-1])
